I've had no luck finding any information about these giant monsters.
They weren't in Ellin Forest, for the short-ish time I was there. But they're everywhere in Leafre. What are all the different kind of giant versions are there, and what do they do? I remember one that said something about healing, and it healed, there was a "beefy" one that I suspect has some high defense or whatever, and I recently ran into one that said "magic eater".